The proliferation of invasive species around the world is one of humanity's worst impacts on the environment, right up there with global warming and our continuing streak of record heat. As a major point of immigration, trade, and tourism, the United States has seen more than its fair share of these invaders throughout its history, but few states have been more affected than Florida. The invasion dates back over a century, but only in the last few decades have ecologists found hope in four species of tiny insects. Each of them attacks the invasive trees in different ways, and together, they have proven powerful. The USDA Agricultural Research Service reports that these bugs can cause a 99% drop in seed production, while also slowing the growth of melaleuca trees.